Without the /S option, RD will only delete an empty folder and
RD /Q will silently fail to delete any folders that are not empty.
If the pathname is a Junction Point, then RD without /S will remove the Junction point itself, not the Junction’s destination folder.

RD does not support wildcards but you can remove multiple folders in one command:

RD C:\docs\Jan "C:\My Documents\Mar"

Exit code / Errorlevel

In normal use RD will fail to return an ERRORLEVEL to the shell, irrespective if the command succeeds or fails the ERRORLEVEL will be left unchanged.